潮汐加速
潮汐加速是行星与其卫星之间潮汐力的效应。这种“加速”通常都是负面的效应，如果卫星是在顺行轨道上运行，会逐渐退行和远离行星（卫星的角动量增加），相对的，行星的自转也会减缓（角动量守恒）。这个过程最终会导致质量小的先潮汐锁定，然后大的也会如此。地月系统是研究这种情况的最佳天体。
卫星轨道周期短于主星（行星）的自转周期，或是逆行轨道的状况，称为潮汐减速，是一种类似的进程（卫星的角动量减少）。
Tidal acceleration
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Tidal acceleration 潮汐加速
Tidal acceleration is an effect of the tidal forces between an orbiting natural satellite (e.g. the Moon), and the primary planet that it orbits (e.g. Earth). The acceleration causes a gradual recession of a satellite in a prograde orbit away from the primary, and a corresponding slowdown of the primary's rotation. The process eventually leads to tidal locking, usually of the smaller first, and later the larger body. The Earth–Moon system is the best studied case.
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